Rectorseal - 81903 - MV3S 6x6 3-way register with 4, 5 and 6 neck Pop Up Are these threaded connections

Are these threaded connections

The sink is fabricated from 18-gauge T-304 stainless steel and finished in lustrous satin with a highlighted rim

Factory-installed plug-and-go power cord means no in-field transformer wiring is required

and the final station capacity depends on the selected module combination

Cabinet: Plastic

Rectorseal - 81903 - MV3S 6x6 3-way register with 4, 5 and 6 neck Pop Up Are these threaded connectionsSpec Sheet Install Manual A plastic ceiling diffuser with incorporated ceiling box. For residential light commercial use & offered in 8"x 8" square, 6x6" square, & 6" and 8" round. Designed for 1 man installation only working below the ceiling, they offer convenience & speed. Features Stepped Collar for multiple duct sizes, Collar tabs easily tear away unneeded sections and Mounting Clip accommodates thicknesses up to 11 4" Virtually air tight